blender 2.8 renders png with transparency inverted
OK.  So after poking at this for a while, I come up with the node ordering going into the mix shader affects the transparency.  I had built an alpha channel png, and I was able to get it to work, and when I inverted the mix shader inputs the result was identical to my original post.

So I went back to my original file, swapped the mix shader inputs, and the scene now works as I expect!

Thx